Three-phase single-stage inverter

An inverter, single-stage technology, used in instruments, regulating electrical variables, converting DC power input to DC power output, etc., can solve problems such as increasing economic costs, cumbersome control methods, and complex structure, and achieve improved efficiency and topology. The effect of stable structure and high output power

Active Publication Date: 2016-06-15
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Greatly increase the overall volume, improve the economic cost
The sum of the output power in the three-phase inverter system is close to a constant value, but three single-phase single-stage inverters directly form a three-phase system with a complex structure and cumbersome control methods

Method used

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  • Three-phase single-stage inverter
  • Three-phase single-stage inverter
  • Three-phase single-stage inverter

Examples

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Embodiment Construction

[0009] Such as figure 1 As shown, this example is a three-phase single-stage inverter, which is characterized in that: the first switching tube S 5 One end of the first diode D 3 The cathode and the external DC power supply U i The positive connection of the second switch tube S 6 One end of the second diode D 4 The anode of the connected external DC power supply U i The negative connection of the third switching tube S 1A , the third diode D 1A The cathode and the first inductance L 1 One end of the connection; the first inductance L 1 One end of the fourth diode D 2A The anode of the fourth switching tube S 2A One end of the connection; the fifth switching tube S 3A , the fifth diode D 3A The cathode and the first inductance L 1 One end of the connection; the first inductance L 1 One end of the sixth diode D 4A The anode of the sixth switching tube S 4A One end of the connection; the sixth switch tube S 4A The other end of the fourth switching tube S 2A The ...

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Abstract

The invention discloses a three-phase single-stage inverter, which comprises a first circuit, a second circuit and a third circuit. Advantages of an isolation transformer in the second circuit are made full use of to solve the problems of a large step-up ratio and electrical isolation. The inverter is a single-input power supply, which overcomes the defect that a dual-input power supply is needed by the traditional output parallel combined single-stage inverter. According to the control strategy, primary and secondary-side dual-modulation is adopted, secondary-side modulation and inversion output are realized, the primary side controls the input current to be a constant value, and no low-frequency pulse exists. In addition, the three-phase single-stage inverter keeps the characteristics of the output parallel single-stage inverter, the number of devices through which the current flows in the case of work is few, and the efficiency is enhanced. The circuit topology is stable and reliable, and the output power is large.

Description

1. Technical field [0001] The invention relates to a three-phase single-stage inverter, which belongs to the inverter in an electric energy conversion device. 2. Background technology [0002] As time goes by, non-renewable energy sources such as coal and oil will run out one day. As a renewable energy source, solar energy will gradually replace fossil energy as the energy supply for human society. Traditional single-phase single-stage inverters have power pulse problems. Therefore, the DC side of traditional single-phase inverters needs to be connected in parallel with an electrolytic capacitor with large capacitance and volume. The overall volume is greatly increased, and the economic cost is improved. The sum of the output power in the three-phase inverter system is close to a constant value, but the direct composition of three single-phase single-stage inverters into a three-phase system has a complex structure and cumbersome control methods. 3. Contents of the inven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M3/335
CPCH02M3/335H02M7/5387H02M1/007
Inventor 嵇保健孙柯洪峰虞超群
Owner NANJING UNIV OF TECH
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